Compressed-air jack.



L. J. ROUGHLEAU. COMPRESSED AIR JACK.

APPLICATION FILED APR. 20, 1912 19 0 WW. 1 m 4% m OJ T n 1 m 0. J no 9 mm f a 2. n AU 4 a m m 9 W 6 P #m U 47 Q w 0 z M m m. W

L. J. ROUGHLEAU.

COMPRESSED AIR JAGK.

APPLICATION FILED APR.20,1912. {0/155 Patenmd Am: 29, 1913.

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. LOUIS J. BOUCELEA U, F ARLINGTON, CALIFORNIA.

COMPRESSED-AIR JACK.

' Specification of Letters Patent. Application filed April 2( 1912.Serial No. 692,11.

Patented Apr. 29,1913.

To all whom it may concern:-

Be-it known that 1, Louis J. Rouomnau, a citizen ofthe United States,residing at Arlington, in the county of Riverside and State ofCalifornia, have invented new and useful Improvements in *Compressed-AirJacks, of which the following is a specification.

The .invention relates to lifting jacks and more particularly to theclass of compressed air lifting jacks. t

The primary object of the invention is the provision of a device of thischaracter in which compressed airis utilized for oper-- which the sameworks, thereby avoiding.

fracture of the said piston' head and also rendering the jack noiselesswhen being operated. a

A further object of the invention is the provision of a lifting jackwhich is simple in construction, easily operated, reliable and efiicientin its-purpose and inexpensive in manufacture. I

With these and other objects in view the invention consists in theconstruction, combination and arrangement of parts as will behereinafter more fully described, illustrated in the accompanyingdrawing, and pointed out in the claim thereunto ap 'pended- In thedrawings: Figure 1 is a side elevation of a jack constructed inaccordance with the invention. Fig. 2 is a vertical longitudinalsectional view thereof. Fig. 3 is a sectional view on theline 33 ofFig. 1. .Fig. 4 is a sectional viewon the line 4- 1 of Fig. 1. Fig. 5 isa fragmentary,

' vertical vsectional view throughthe two part detachable handle. Fig. 6is a sectional View on the line 66 of Fig. 5. Fig. 7' is a fragmentaryvertical longitudinal sectional view through the exhaust pipe and itsvalve. Fig. 8 is a top plan view of the device.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawings.

Referring to the drawings by numerals, the lifting jack comprises a base10, the same being formed with a central circularshaped recess 11 havingits side wall provided with screw threads 12 detachably engaged by theexteriorly screw threaded end 13 of a piston cylinder 14, rising fromthe saidbase 10, the opposite outer end of the said cylinder 14 beingexteriorly screw threaded for the detachable engagement therewith of ahead cap 15 between which and the edge of the outer end of the saidcylinder 14 is placed a packing ring 16- for a purpose hereinafterdescribed.

Formed centrally in the cap 15 is an afperture-17 through which ispassed a 1i ing stem 18, provided with an outer screw threaded end 19and having detachably connected thereto a rest piece 20, on which isadapted to bear the object to be raised by the jack, in a manner to bepresently described.

. Theinner end of the stem or bar 18 is formed with a flared portion 21,the same bein centrally connected to a piston head 22, ormed with aconcaved face 23, the piston head 22 being designed to work within thecylinder 14, and is adapted to travel longitudinally therein.' The saidpiston head 22 is formed with a peripheral rim 2 1, upon the upper edgeof which is superimposed spaced packing rings 25, between which isarranged a packing 26and against the uppermost packing ring there is anadjustable retaining ring 27 the same being ongaged by means ofadjustable clamps 28 having swiveled therein regulating bolts 29, thesame threaded in inset lugs 30 formed on the flange 24, whereby on theadjustment of 1 the bolt 29 the ring 27 may be forced tightly againstthe uppermost rin 25, thereby compressing the packing 26, t erebycausing it to expand outwardly between the rings 25,.

so as to closel contact with the inner surface of the cylinder 14, so asto'form a fluid tight joint between the piston head and the same,thereby avoiding leakage of fluidfrom one side of the piston head to theother within the cylinder.

Forined in-.-; the base are inlet and outlet conduits or vents 31 and 32respectively, the

inner ends of which 0 en into the lower end of the cylinder 14, whilethe outer ends have fitted therein couplings or nipples 33 for theconnection of the respective inlet and exhaust tubes 34 and 35, the tube34 being rovided with a back. pressure springeld check valve 36, whilethe exhaust tube 35 has "connected thereto a hand operated cutoif lobevalve 37 of'the ordinary well-known construction. The inner tube 34 isadapted to be connected with a compressed air pump of any ordinarywell-known construction, so as to supply compressed air to the cylinder1 14, whereby said compressed air will act against the piston head 22for forcing outwardl a lifting stem, or bar 18 for the raisin 0 anobject by the jack.

Vhen it is desired to exhaust the compressed air fluid from the cylinder14, it is only necessary to open the cutoff valve 37,

whereby the said fluidmay be discharged to the atmosphere.

Fixed to or inte ral with the base 10 at any desired point t erein isahandle receivin socket member 38, in which is detachab y threaded theinner section 39 of a hansame being detachably connected to the innersection 39, thereof, by means of a coupling sleeve 41, thus it beingseen that the handle may be shortened or lengthened as the occasion mayrequire and this handle l enables the jack to be placed beneath theobject at the proper location for the lifting thereof.'

From the foregoing description, taken in connection, with theaccompanying drawing, it is thou ht that the construction and operationof t e.invention will be clearly understood, and therefore, a moreextended explanation has beenomitted, i

What is"claimed is:

A piston for air jacks comprising a piston head having a concavedportion at one end and a recess in its opposite end, the walls of therecess being slotted at diametrically op posite points, lugs integrallyformed with the walls ofthe recess and projecting into the same andalining with said slots, the said head being formed with a packingseatin the side thereof, an expansible packing located within the seat,packing rings arranged on opposite sides of the packing and mountedwithin the piston head, a retaining ring circumscribing the said pistonhead and adjustably movable in the packing seat, clamps mounted in theslots and working against the retaining ring, and adjustable boltmembers loosely engaged in the clamps and threaded in the lu s. I dlewhich includes an outer section 40, the i In testimony whereo I afiix mysignature in presenceof two witnesses. LOUIS J. ROUCHLEAU. Witnesses:

ARTHUR BERGERON, VIE. COLE.

